Calcium ortho-benzyloxybenzoate



Patented Jan. 22, 1924.

UNITED STATES PATENT OFFICE.

'EBNET A. WILDMAN, OF RICHMOND, INDIANA, ASSIGNOR T0 SWAN-MYERS (30., OF INDIANAPOLIS, INDIANA, A OORPQRATION OF INDIANA.

CALCIUIgl ORTHO-BENZYLOXYBENZOATE.

No Drawing.

To all whom it ma comm:

Be it known that Ems'r A. WIwMAN', a citizen of the United States, residing at Richmond, in the county of Wayne and Application filed April 18, 1921. Serial No. 462,381.

of which the following is :1 specification.

My invention relates to calcium orthobenzyloxybenzoate, the calcium salt of in State of Indiana, have invented new and ortho-benzyloxybenzoic acid. having the foluseful Calcium Ortho-Benzyloxybenzoate, lowing formula:

o=c o 0a- -==o H l H n-c c -o-l c n-c o-o-d n- E 1i n-c o-n E- -n 1 1 n-c c-n n- -H n- -n This may be considered as a derivativ of salic lie acid, in which the hydrogen atoms 0 the carboxyl groups have been replaced by an atom of calcium, and the hydrogen atoms of the phenolic hydroxyl groups have been replaced b the benzyl radical; or as a derivative 6 the calcium salt of salicylic acid, in which the hydrogen atom of the phenolic hydroxyl roup of each salicyl radical has been rep aced by the benzyl radical. It is the object of m invention to produce a readily administere water-soluble medicinal compound which has the desirable properties o the benzyl radical combined with those bf the salicyl radical, and which at the same time is free'or more nearly free from the objectionable features of the compounds at resent used to obtain these medicinal e ects, such asbenzyl benzoate on the one hand and salicylic acid on the other hand; and which has a high acid-radical content, and can be obtained in solid form by evaporation of its water solution.

My present invention is directed specifically to the calcium salt of ortho-benzyloxybenzoic acid. This calcium salt, however, is included inthe generic invention set forth in my co-pending application, Serial No. 644,459 filed June 9, 1923, which generic invention is directed to a number of salts of this acid.

This calcium salt is probably most conveniently prepared b using ortho-benzyloxybenzoic acid as t c starting point, especially when the pure salt is desired; though this salt can be made without first making the acid as an isolated roduct.

A process of preparation 0 the acid,

which process, however, is not part of the invention here claimed, is as follows: 23 parts by weight of metallic sodium are dissolved in about 400 parts-of alcohol, 150 475 parts of methyl salicylate and 130 parts of 'benzyl chloride are added, and the mixture is boiled until, usually after about an hour,

it is apparent from precipitation of sodium chloride that the reaction is complete. The alcohol is then distilled oil (and preferably recovered) from the remaining oil, and this remainder is shaken ,with water to remove the sodium chloride and an saponified material. After such remova the remaining,

oil material is then boiled with 45 parts of water, and easily soluble in dilute alkalis and the most organic solvents. Its melting pointis 75 C. Its chemical structure is shown by'the formula given above, save that two hydrogen atoms are substituted for the calcium atom, to produce two molecules of the acid.

Typical methods for the preparation of the calcium salt from this acid are as follows:

Method A: Two molecular proportions of I may be done without first 'solution may not always ortho-benzyloxybenzoic acid and one molecular proportion of powdered calcium carf j bonate are boiled together in about twenty parts of water until the evolution of carbon dioxide has ceased. "lbe solution is then cooled, and the crystalline preci' itate, which is the calcium salt, is filtered o and washed with a little cold water.

Method B: The calcium salt may be prepared from the sodium salt,'which is inchided in the subject-matter of my aforesaid cry-pending application. If desired, this making the acid, the acid the such process which exists ior in the process of making sodium salt is first made, as in of making the acid the solution prior to the acidification -with-sulphuric acid is of the Sodium salt-sodium orthobenzyloxybenzoate. Ordinarily, however, this solution contains other'materials as impurities, so that the sodium salt is ordinarily not obtained in a pure state; and in consequence the calcium salt prepared froin'th-is I h h be of the desirl'ed purity. f a i er urit is" necessar t 1e process of making the acid from this first solution of the sodium I proportions of such acid are boiled with a solution of one molecular proortion of sodium carbonate in water. evithin a fewminutes the mixture becomes a clear solution of the sodium salt,'wh-ich may be obtained in solid form by evaporatthere is added an salt is completed invthe manner above described; and then two molecular ing to dryness on a water bath. 'The calcium salt liaps the less pure sodium salt obtained in the process ofmaking the acid, as follows: To a 10% solution of the sodium salt (sodhim ortho-benzyloxybenzoate) in Water excess of a 40% solution of calcium chloride in water. The calcium ortho-benzyloxybenzoate crystallizes out, and is filtered ofi and washed with cold water.

This calcium salt (calcium ortho-benzyh oxybenzoate) is a substantially white powder, sparingly soluble in water-in about 90 parts of water at 20 C. It has an acidradiealcontent of about 92%. It'is obtainable in solid form by evaporation of its water solution. it'y materially ammonia;

The foregoing processes of preparation are givenmerely by way of example, and my invention is not limited to products obtained by the processes iven.

claim as my invention:

The calcium salt of ortho-benzyl-oxyhenzoic acid.

In witness whereof, I have hereunto set 'my hand at Champaign, Illinois, vthis 12th day of April, A. D. one thousand nine hundred and twenty-one.

ERNEST A. WILDMAN.

may be made from the sodium salt, either this purified sodium salt, or per- 

